Case bypass modification:
Minimum 11mm – Optimum 12.7mm (1/2″inch)
To do this modification properly, you will need an oil bypass kit. See one HERE. Please feel free to contact us with any questions.
The following reference downloads are available to you free of charge.
Bypass modification inside case
Bypass modification inside case
Reference Downloads:
911 Crankshaft Oiling Groove
Sometimes called, “center fed oiling” or center grooving
BYPASS PORT REFERENCE
BYPASS PORT REFERENCE
Bypass Port-911 Engine Case
For all instances where the oil pump is being replaced, this bypass modification is necessary.
Bypass Modification
Starting in 1976 the 911 engine's oil bypass system was changed
911 Oil Bypass
911 Oil Bypass exploded view
Relief valve - Safety valve FOR 964/993
Relief valve - Safety valve FOR 964/993 ONLY!!!
Our Services
- Oil Pump Rebuilding
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